单项选择题

The law of supply and demand will eventually take care of a shortage or （）of dentists.

A．surge
B．surplus
C．flush
D．fluctuation

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单项选择题

Some felt that they were hurrying into an epoch of unprecedented enlightenment, in which better education and beneficial technology would （）wealth and leisure for all.

A．maintain
B．ensure
C．certify
D．console

单项选择题

Located in Washington D. C. , the Library of Congress contains an impressive （）of books on every conceivable subject.

A．flock
B．configuration
C．pile
D．array

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